Apparatus and Method of Blind Modulation Classification of BPSK/QPSK Robust to Severe Offsets in satellite communication system

摘要

1. This invention belongs to the art described in the claims ; the invention. Will have about the error on the robust BPSK / QPSK modulation blind classification apparatus and method in a satellite communications system ; 2. SUMMARY OF invention to solve the ; This invention is a frequency error, phase error, so as to become robust against the variation of the signal, such as a timing error, the approximate unusual characteristics by shortening the observation interval normally created, the approximate normal by observing the interval during which various intervals so as to have a more robust performance in non-ideal communication environment, the robust BPSK error in the satellite communication system / QPSK modulation blind classification apparatus and its object is to provide a method that. ; 3. Solution subject matter of the invention ; This invention is a blind modulation classification device in a satellite communication system, the receiver for computing the likelihood that each of the band signals for each modulation scheme (BPSK / QPSK) first and second likelihood calculating means; Obtain the maximum value based on the likelihood values calculated by the first and second likelihood calculating means, a flag corresponding to the determined maximum value is set to "1", and the other is the maximum value setting means for setting to "0"; First and second summing means for summing the flag Flag for each modulation scheme (BPSK / QPSK) is set at the maximum value setting means; Select the maximum value among the sum of the first and second flags via the flag summing means, and the modulation scheme flag setting means for setting the flag corresponding to the modulation scheme selected maximum value; And said first and second likelihood calculating means, the maximum value setting means, wherein the first and second flag summing means, and the two modulation schemes for modulating the combined classification repeatedly output the same modulation flag and flag setting means ( and ) including a modulation scheme determining means for determining a classification large modulation classification of the actual modulation classification. ; 4. An important use of the invention ; The present invention used to fight and satellite communication systems.